The universality and popularity of general fitness programs is partly because they have nothing to do with physical talent.
Your genetics do determine many of your physical capabilities at advanced levels, but rarely at ordinary levels. Short people can be fine basketball players, for example - but not at a college level. Long-limbed people can do good bench presses and deadlifts, although not as readily as compact people. Everybody can run, swim, and do bench presses. Most people are physically effective but not blessed with special talents. That is why general fitness is popular - anybody can engage in it.
Besides your physique/physical structure, genes determine your ratio of fast-twitch to slow-twitch muscle fibers, your neuromuscular connections, your brain-neuromuscular responses, eye-hand coordination, your aggressiveness and energy, lung volume, etc.
Not to mention non-genetic factors like drive, training, and practice.
The point I wish to make is that, as with musical talent or intellectual horsepower, everybody has a level at which they can best perform, and few people ever reach those levels. In fitness, your only competitor needs to be yourself from last month.
Of course, we all have varying degrees of competitiveness, but that should never be any obstacle. Not one of our readers will play in the NFL, the NBA, or in the US Open. Or, for that matter, perform in the NYC Ballet.
My advice, to be able to engage in the fullness of life, is to get out and move hard every day with weights, calisthenics, cardio, etc - and to do a lousy job of it if need be because there are no grades. Giving it your all is all that is required.
